statement of the problem : tooth restorations are exposed to stresses which produce marginal gaps resulting in microleakage. purpose in this study, microleakage of light-cured glass-ionomer and compomer class v restorations was evaluted and compared under cyclic loading materials and methods in this exprimental study, class v cavities were prepared on the buccal surfaces of maxillary premolars ...

PURPOSE The aim of this study was to evaluate the effect of cyclic loading and screw retightening on reverse torque value (RTV) in external and internal type implants. MATERIALS AND METHODS Cement-retained abutments were connected with 30 Ncm torque to external and internal type implants. Experimental groups were classified according to implant connection type and retightening/loading protoco...

To investigate the mechanical properties of Q460 high-strength steel under repeat tensile loading, 45 specimens were prepared for repeated tests. The are tested 16 different loading regimes. effects welded joints, specimen shape and dimensions, modes on analyzed. In addition, a finite element model cyclic load was established with ANSYS numerical results compared those experimental This can acc...

Plastic deformation during low-cycle fatigue (LCF) in equiatomic face-centered cubic (FCC) CoCrFeMnNi high-entropy alloys (HEAs) is accumulated by dislocation substructure formation, which leads to crack initiation. Whilst these substructures have been reported before, little has done clarify their formation mechanisms and the effects of strain amplitude, cycle number grain orientation. In this...

The article examines the possibility of using converted aircraft engines for gas pumping units example main parts GTE - disks NK-8-2U engine and NK-16ST NK-16-18ST ground engines. For all second stage low-pressure turbines three engines, stress-strain state calculation was performed boundary integral equations method (BEM) FEM in Ansys program. disk stress concentrators, theoretical concentrati...

This paper presents a numerical investigation on seismic performance of reinforced concrete (RC) cantilever columns under unidirectional and bidirectional excitations. The influence cross-sectional geometry multiple excitations have been examined in this study. An advanced nonlinear finite element model is employed to different failure modes RC excitation. simulates degradation materials cyclic...

Tension-stiffening controls the serviceability behavior of concrete structures as it is responsible for crack formation and, consequently, deflection beams. In fiber reinforced concrete, such ultra-high performance (UHPFRC), fibers bridge cracks and thereby transfer tensile stresses across cracked region, allowing to be carried by within region. Due being designed longer design lives, considera...